P51178-B21 - HPE BCM 5719 1GB 4P BASE-T Adapter Cisco Switch Range_Cisco IE 2000 Series P9D93A) if one 16G link

P9D93A) if one 16G link is enough and you want to save cost/slot

Closet uptime: hot-swap PSUs/fans plus Perpetual/Fast PoE to keep endpoints alive during reloads

Cost-conscious SATA storage

Two hot-swap PSU bays (supports 1+1 redundancy)

P51178-B21 - HPE BCM 5719 1GB 4P BASE-T Adapter Cisco Switch Range_Cisco IE 2000 Series P9D93A) if one 16G linkHPE P51178 B21 Broadcom BCM5719 1Gb 4 Port BASE T Ethernet PCIe Adapter What it is P51178 B21 is an HPE 4 port Gigabit Ethernet network adapter based on the Broadcom BCM5719 chipset. It provides four 1 GbE BASE T RJ 45 ports and connects to servers via a PCI Express (PCIe) slot, adding reliable Gigabit LAN connectivity to HPE servers that need multiple NIC ports. Why buyers pick P51178 B21 (plain English) Multiple Gigabit ports in one card: Four 1 GbE